<html>
<head>
	
	<link rel="stylesheet" type="text/css" href="extjs/resources/css/ext-all.css">
	<script type="text/javascript" src="extjs/ext.js"></script>

</head>

<body></body>

	<script type="text/javascript">

	Ext.define('MinhaJanela',{
		extend: 'Ext.window.Window',

		title: 'Minha Janela',
		html: 'criei uma janela',
		height: 200,
		width: 200,
		autoShow: true
	});
	
	Ext.onReady(function(){

		Ext.create('MinhaJanela');
	});
	</script>

</html>